[Coco] No pixel wasted

[Luis Antoniosi (CoCoDemus)]

each computer has a different video output. CSync, Negative HS/VS, Positive
HS/VS, 1.2-2.0V RGB at 60Hz, 0.8-1.6V PAL at 50Hz  etc.

Make them all to work in FPGA would be impossible or utterly complex that
would not fit. Voltage wise is impossible. I would need specialized ADCs
etc.

I am not even sure if I can use a MUX to switch between NTSC and PAL PLLs.

My target is make a Coco3 pristine output.









Luis Felipe Antoniosi



On Thu, Sep 18, 2014 at 12:22 PM, S Klammer <sklammer at gmail.com> wrote:

> Yet, based on his "fantastic" progress, having it provide the same
> stability for the other modes in the same hardware is definitely
> beneficial.
>
> I presume this utilizes the CC3 RGB port... could this design (or a minor
> addition) also support composite video?
>
> sk
> On Sep 18, 2014 12:13 PM, "Steven Hirsch" <snhirsch at gmail.com> wrote:
>
> > On Wed, 17 Sep 2014, Luis Antoniosi (CoCoDemus) wrote:
> >
> >  I reduced the speed from 229Mhz to 114Mhz, the SDRAM works better now:
> >>
> >> http://imgur.com/MY0ExuW
> >>
> >> It also fixed the artifact in coco1/2 graphics screen.
> >>
> >> But for coco3 games like roboco, thexder I still get some minor
> flickering
> >> in some areas. Like it generates those video modes with a slightly
> >> different pixel clock ? I have a 1986 GIME only.
> >>
> >> All the other resolutions are pixel perfect: 32, 40, 80 columns, pmode
> 1,
> >> 2, 3 and 4.
> >>
> >
> > I am utterly disinterested in gaming, but would really like a stable
> > 80-col solution.  Let us know when the design is finalized?
> >
> > Steve
> >
> >
> > --
> >
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > https://pairlist5.pair.net/mailman/listinfo/coco
> >
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>